Of the 5 numbers, whose average is 80, the first is one-fourth…

Of the 5 numbers, whose average is 80, the first is one-fourth of the sum of the last 4. The first number is?

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #60473